Update to c0855c6cae of web-socket-js

Update both the submodule and the swf build. The submodule now
contains the unobfuscated source for swfobject.js which should make
websockify more DFSG compliant.
Use upstream einaros/ws 0.4.27 with sub-protocol support.

Also, some connection error handling.
Add package file for websockify.js
Move javascript websockify files to other/js
Update to version 0.5.1

*** NOTE ***

This version of websockify no longer supports the old Hixie protocol.